A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

The James Webb Telescope captures the beginning of planetary formation around the young star HOPS-315 for the first time.

Scientists have recently proposed the existence of “Planet Y,” a hidden Earth-sized world that could be lurking in our solar ...

A recent study by Princeton University astronomers suggests the possible existence of a previously undetected planet in our ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

New observations suggest that the dwarf planet Makemake is surrounded by faintly glowing methane gas. Scientists are unsure if the gas is contained within a wispy atmosphere or being ejected into ...

For all the talk about life across the cosmos, Earth remains the only confirmed example. That single data point makes your ...

The official number of exoplanets—planets outside our solar system—tracked by NASA has reached 6,000. Confirmed planets are added to the count on a rolling basis by scientists from around the world, ...

From lava worlds to gas giants, NASA says the variety of these worlds is staggering—and that signs of a further 8,000 distant ...